Syringe



June 16, 1925. 1,542,777

J. w. B. LADD SYRINGE Filed Jan` 30, 1925 Patented June 16, 1925.

g ,i 1,542,777 AUNrrgenfrsrsrsrafrltNl OFFICE.

JOHN w'. B'. Lann, or BosToN, MASSACHUSETTS, assrcnon To RANDALL-FAICHNEY CORPORATION, BOSTON, MASSACHUSETTS, A

CORPORATION OF ll/fASS-ACHUSETTS.r

svnnven.`

Application filed January-30, 1925. Serial No. 5,736.

To @ZZ wiz om t may concern Bev it Aknown* that I, JOHN B. Lann,

of .lama-ica Plain District,l Boston, in the` county of Suffolk'and kState ofMa-ssachusetts, a citizen of the V,United States, have.

invented anfImprovement inV Syringes, of which the following description, in connection with the accompanying drawings, is a specification, like characters' Aon the drawings representing like parts.

This invention relates to a syringe of the class in which a flexible bulb is used to eX- pel the liquid from the barrel, and is more particularly concerned withnovel featuresv relating tothe protection of the rubber bulb, and the facility of cleansing the same.

The invention will vbe best understood by reference to the following description, when taken in connection with the accompanying drawing of one specific embodiment thereof,

while, its scope will be more particularly pointed out in the appended claims.

The single figure of the drawing is a central, longitudinal section of a syringe exempli fying the invention.

Referring to the drawing, and to the embodiment of the invention which is selected for eXemplification, there is shown a syringe having a barrel 1, which in practice is usually made of glass, the same having a nozzle 2 appropriat `y shaped for the class of work which the syringe is intended to do, said nozzle having an orifice 3 for the discharge of the liquid under the influence of a flexible bulb 4, usually made of rubber. This bulb has a wall 5, which is snugly received in the adjacent end of the barrel 1, and is comparatively thin, thus presenting a relatively large openinv 6, facilitating a thorough cleansing of the interior, of the bulb.

f bushing 7 also received in the barrel, presents a capillary passage 8, which affords a way of communication between the chamber within the bulb and the chamber within the barrel, and permits air to be expelled from the bulb into the barrel, but prevents the entrance of liquid from the barrel into the bulb.' In the present example, this bushing has a portion 9, which is received within and encircled by the wall 5, the latter therefore being interposed between that portion of the bushing and the surrounding wall of the barrel. The thickness of the wall 5 is somewhat greater than the 'two' walls between which it is received, and therefore the rubber is under compression and prevents' leakage. In the present instance,the bushing presents a lateral enlargement, such as a circumferential ,bead or flange `10, which holds the rubber under evengreater pressure atfthis point, and prevents leakage, while, at the same time, preventing the bulb from being accidentally withdrawnl from itsl place. y

The bushing may be, and herein is, provided with an enlarged portion or collar 11, which is separated from the internal surface of the barrel by a capillary space 12, which prevents the entrance of liquid at this point, thus protecting the adjacent end of the rubber ball 5 from the action of the liquid in the barrel, and also preventing contamination of the contents of the syringe'by matter which might otherwise lodge at this point.

the end of the wall 5.

vIn the present instance, the bushing is made of glass, which is conveniently formed of a piece of tubing heatedr and appropriately shaped, and the capillary passage 8 isV formed in a reduced portion or neck 13, which may have a tapered formation. s

'I'Iereim the rear end of the barrel, which receives the bulb, is provided .with a laterally extending iange 14, which may be flared somewhat in order to facilitate the introduction of the bulb, and tov form a funnel through which liquid may be poured into the barrel. The parts can be very readily cleansed by simply withdrawing the bulb from its place, carrying with it the bushing, after which the latter can be removed from the bulb, and all three parts then cleansed in a most thorough manner. The advantages of this construction will therefore be apparent. y

Having thus described one embodiment of the invention, but without limiting myself thereto, what I claim and desire by Letters` Patent to secure is:

1. In a syringe, the combination of a barrel, a bushing received in said barrel, and presenting a capillary passage, and a vHexible bulb having a chamber communicating by way of said passage with said barrel, said bulb ha\f'ing a wall interposed between a portion of said bushing and the surrounding wall of said barrel.

2. In a syringe, the combination of a barrel, a bushing received in said barrel and wall', and a flexible bulb havinga chamber communicating by Way oi .said passage with barrel, said bulb having a Wall interposedy 'between said reduced portion and said surrounding Wall of said barrel.

4;. In a syringe, the Combination of a barrel, a part reeeived in Said barrel and presenting a capillary passage, a. part presenting a shoulder within said barrel, and a flexible. bulb having` a chamber communicating by Way of said. passage With said barrel, said bulb having a wall interposed between the first-n'ientioned part and the surrounding Wall of said barrel and presented end- \vise against Said shoulder,

In testimony whereof, I have signed my naine to thisl speification.

'JOHN vv. B. Lann. 

